PracticeQuiz content is free on an ad-supported model.

Unfortunately, we can't support ad blocker usage because of the impact on our servers. If you'd like to continue, please disable your ad blocker and reload page.

Reload page

SAT Biology Subject Test Practice Questions

Category - Biology

Start a Study Session Sign up for Question of the Day

A flock of grasshopper sparrows moved into the area before the dominant plant changed from weeds to grasses. The grasshopper sparrow is the ____________.

Primary organism
Pioneer organism
Secondary organism
Tertiary organism
Quaternary organism

Explanation

Answer: B, Pioneer organism. Succession always begins with a pioneer organism population moving into the area.

Key Takeaway: It is the pioneer organism that drives succession. If the pioneer organism is successful, it will change the environment in such a way that new populations can move into the area. As populations are replaced, changing plant forms will attract different types of animals.

Photo: Grasshopper sparrow - photo from the US Park Service

Previous Next

Was this helpful? Upvote!

Start a Study Session Sign up for Question of the Day

SAT Biology Subject Test Practice Questions

Top questions

Related questions

Most popular on PracticeQuiz

Ad-Blocker not supported

SAT Biology Subject Test Practice Questions

Top questions

Related questions

Most popular on PracticeQuiz